How do trees draw?

This kind of "paint" is a temporary insecticide made by the gardener. It is made of water, quicklime, sulfur powder, salt, clay and a little oil by a certain proportion and process. Before winter, the gardener brushes this medicine on a section of trunk which is 1- 1.5 meters above the ground, which is called "painting white". Whitening is an important content of greening maintenance management in winter, which has many protective effects on trees:

First of all, as the weather turns cold, many kinds of pests on the tree climb to the ground along the trunk to find a suitable environment to avoid the cold, and the bark of the painted trunk itself is an important place to hide pests, eggs and pathogens. When the flowers bloom in the next spring, these pests will come back to the trees to harm them, and pathogens will breed and infect them. Whitening is an effective means to prevent and control the weak links of pest transmission, which can significantly reduce the occurrence of pests and diseases in the next year.

Secondly, on sunny days in winter, the sunny side of the trunk and branches is exposed to direct sunlight, and the temperature rises, which makes the tree cells active. However, at night, the temperature drops rapidly, which makes the bark tissue too late to adapt and suffer from freezing damage, resulting in the so-called "sunburn" phenomenon. In particular, trees with thick trunks, dark colors and poor tissue toughness are more susceptible to freezing. The painted trunk can reflect 40-70% sunlight, reducing the temperature difference between day and night, thus preventing the occurrence of freezing injury.

In addition, white painting can also make trees give people a white and neat aesthetic feeling.